Did you do the following:
Used XPKey.exe to generate a valid key (for XP Home not Corp).
Used the Windows XP Product Key Modifier to change your key.
Rebooted your computer.
Checked it with ViewKeyXP.exe to see if your key had been successfully changed.
If you did all this and it didn't work, just try another key generated by XPKey.exe until it works. It will eventually.
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